Back Button after Commenting (1 post)

Hi,
This is not only a wp problem but i am trying to find a way to avoid this situation :

If after submitting a comment, you hit the back button (which many people use it when navigating) it would keep the form data and sometimes people can hit submit again. ( wp will detect duplicity of content ) but if someone just changes one word or think that comment needs to be sent again i could get similar post twice.